摘要
以浓H2SO。为催化剂，采用甘油一甲醇复合溶剂体系，利用高温高压下甲醇的超／亚临界效应，探索了原料粒径、液化时间对杂木屑液化效果的影响。研究结果表明：在1L的高压釜内，甲醇300g，甘油150g，浓硫酸1.5g，粒径为0．28—0．90mm的杂木屑60g，在250℃下反应10min，然后通冷却水快速冷却，木屑转化率为88．87％。利用精馏分离方法对液化油进行分级分类，分别收集70℃以下，70～80℃，80～90℃三个温度段的馏分，进行精馏试验的物料衡算，并通过GC—MS分析各馏分的物质构成，结果表明，各馏分的物质构成较复杂，但主要是一些小分子含氧衍生物，包括烃类、醇类、醛类、酯类、酮类以及芳香族等类别化合物。通过液化油与其精馏釜残留对比分析结果发现，两者在官能团构成、分子量分布上区别不大，说明液化油稳定性较好，在精馏过程中并未发生过多的聚合反应。
The mix sawdust was liquefied by glycerin and methanol mix solvents in a I L stainless steel with high-pressure autoclave by catalytic action of concentrated sulfuric acid and the super/ sub-critical effect of methanol in high temperature and high pressure. The influence of the diame- ter of raw material particles and the reaction time to liquefaction residue was investigated. The re- sults showed that when methanol was 300 g, glycerin was 150 g, concentrated sulfuric acid was 1.5 g, the grain size of 0.28~0.90 mm of mix sawdust was 60 g, in 250 ℃ with 10 mins, then rapid cooling with the sawdust percent conversion was 88.87%. The liquefaction-oil was rectified and classified. The distillates were obtained under 70 ℃, 70-80℃ and 80-90 ℃ respectively. Then the compositions of the three distillates were detected by GC-MS. The results showed that each distillate is complex, the compounds contained hydrocarbon, alcohol, aldehyde, ester and aromatic compounds, and so on. Through the comparison of liquefaction-oil and the rectification kettle residue ,It showed that there are not much difference in functional group composition and molecular weight distribution be- tween the liquefaction-oil and the rectification kettle residue. It proved that the liquefaction-oil is stable, which didn＇t polymerize very much in the rectification process.
出处
《可再生能源》
CAS
北大核心
2012年第10期84-88,92,共6页
Renewable Energy Resources
基金
林业公益性行业科研专项经费项目(201204801)
关键词
复合溶剂
超/亚临界
木屑
液化
精馏
mix solvents
super/sub-critical
sawdust
liquefaction
rectification
